Pull off some panels here and there and get a good look at the quality of construction, or lack thereof more accurately, and you might be more inclined to consider the extended. I bought one and it's earned it's keep. Fridge control board toasted. Transfer switch twice. Leaky hydraulics, burned out stabilizer motor, microwave flew south for the winter, yada yada. Quite a list of out of factory warranty issues. Luckily the extended warranty provider has been good to work with and hasn't balked at anything, or denied anything, and has been more than willing to work with the service center I use which is no where NEAR a dealership. My experience with dealer service centers has by no means been positive.
The most unusual thing about my unit is the poorly reviewed China Bombs have held up fine so far through 3 1/2 seasons. Front and rear axles are on their way out though and are going to need replaced soon. I'm guessing 12-15 thousand miles on them, and they get the ***** scrubbed right out of them going in and out of my drive.
Anyway, I wouldn't equate an automotive extended warranty with one designed for the rv market. Auto warranties are usually a waste, but todays autos can usually be subjected to more than a few weeks of actual use before they start to fall apart.